Pulling apparatus



C. H. WALLICK.

PULLING APPARATUS.

APPLICATION FILED APR. 4, 1919.

1,33 1,298. Patented Feb. 17, 1920.

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Suva utoz- Charles H. Wall ich' Witnesses w, (@wW A C. H. WALLICK.

PULLlNG APPARATUS.

APPLICATION FILED APR 4,1919.

1,33 1,298. Patented Feb. 17,1920.

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PULLING APPARATUS.

APPLICATION FILED APR. 4, 1919.

Patented Feb. 17, 1920.

Snow Ito: Charles H. Wallicic 3 SHEETS-SHEET 3v Jig. .16

w W a Witnesses CHARLES HENRY 'W'ALLICK, GE OMAHA, NEBRASKA.

PULLING APPARATUS.

Application filed April 4, 1919.

To all whom it may concern:

Be it known that 1, CHARLES H. VVALLICK, a citizen of the United States, residing at Omaha, in the county of Douglas and State of Nebraska, have invented new and useful Improvements in Pulling Apparatus, of which the following is a specification.

My present invention has to do with pulling apparatus.

One of the objects of the invention is to provide a pulling apparatus through the medium of which great power may be manually exerted.

Another object of the invention is the pro vision of a pulling apparatus designed primarily for removing stators from the steel shells of electric fans, such, for instance, as fans which may be definitely described as lVestinghouse alternating current drawnmetal frame fans, and this without damage to the shells. The apparatus is also adapted to be used to advantage in replacing stators in the steel shells of electric fans such as alluded to.

In electric fans of the type referred to,

the stator is forced under heavy pressure into the steel shell at the time of manufacture, and in the event of the fan developing trouble in the winding, or in the event of the switch cord being broken ofi in the oscillating type of fan, the stator must be displaced from the shell in order that the fan may be properly repaired with facility. It is not feasible to remove the stator by driving the shell from the stator, as the only effect of such operation would be to cause the shell to swell around the stator, with the result that damage would be inflicted upon the shell and it would be rendered much ti hter about the stator.

My novel apparatus is adapted to accomplish the purpose desired expeditiously and without injury to the fan or any of its parts, and with but little effort on the part of the operator; and its novelty, utility and practical advantages will be fully understood from the following description and claims, when the same are read in connection with the drawings, accompanying and forming a part of this specification, in which:

Figure l is a side elevation of the apparatus, constituting the best practical embodiment of my invention that I have as yet devised.

Specification of Letters Patent.

Patented Feb. 17, 1920. Serial No. 287,407.

Fig. 2 is acomplete longitudinal, vertical section of the same.

Fig. 3 is a front end elevation of the apparatus.

Fig. at is a transverse section, taken in the plane indicated by the line 4l4: of Fig. 1.

Fig. 5 is an elevation of the outer end of the stator-penetrating element of the apparatus per cc.

Fig. 6 is an elevation of the inner end of said element.

F ig. 7 is a perspective of a comparatively large stator-penetrating element of larger size than the corresponding element shown in Figs. 1 to 6, and designed to be used interchangeably; the said large size element being designed for removing stators, having an inside diameter of two and three-eighths inches, and being similar in construction to the penetrating element of Figs. 1 to 6.

Fig. 8 is a plan view of the taper pin comprised in the apparatus.

Fig. 9 is an enlarged cross-section of the same, taken in the plane indicated by the line 9-9, of Fig. 8.

Fig. 10 is the rear elevation of the apparatus.

Fig. 11 is a view of so much of an electric fan motor as is necessary to contribute to the disclosure of my invention.

Similar numerals of reference designate corresponding parts in all of the views of the drawings,

Among other elements, ratus comprises a shell-like body 1, said body being arranged upon a base 2 and being open at its forward end and closed by a wall'3 at its rear end. In said wall 3 is a longitudinal central smooth-bore aperture 4, and in the front end of the body 1 is an internal shoulder 55.

1 Bearing in the aperture 4 and against the outer side of the wall 3 is the rear portion of a longitudinal central screw 6. The said screw 6 is headed at 7 and equipped with a handle 8 that is disposed in a diametrical aperture in the head. In front of the said head is provided a smooth, cylindrical reduced portion 9 that bears in the aperture 4, and in front of said portion 9 is the shank of the screw; the said shank being preferably formed of chrome nickel steel and being preferably provided with twelve threads to the inch.

my novel appaflanged. disk ratus; it

At 10 the shell-like body 1 is provided with an aperture for an important purpose hereinafter set forth; the said aperture being located adjacent to the forward end and to of the body.

Ihreaded upon the shank of the screw 6 and disposed in front of the body 1 is a 11, preferably of cast iron.

Mounted upon the shank of the screw 6 -and disposed in front of the disk 11 is a stator-penetrating element 12 of the appabeing understood here that the stator-penetrating elements illustrated are adapted to be used interchangeably for work of different sizes and that they are identical in construction. The stator-penetrating element 12, shown in Figs. 1 to 6, is provided with a longitudinal, central bore 13 to engage the shank of the screw and is preferably formed of cold rolled steel. At opposite sides of the bore 13 the element 12 is provided with two longitudinal bores 1st and 15; the said bores being of different diameters, and the bore 14 being drilled with a quarter of an inch drill and reamed out with a N0. 5 taper pin reamer, while the bore 15 is drilled with a seven thirty-seconds of an inch drill. .The perimeter of the element 12 is roughened as indicated by 16, and is preferably case hardened. At 17 the element 12 is slitted throughout its length, the said slit intersecting the bores 14 and 13 and extending throughout the length of the element 12 and also extending from the perimeter of the element to the near side of the bore 15.

In addition to the elements enumerated,

my novel apparatus comprises a taper pin' 20, having flat sides 21 and 22.

When not in use, the pulling apparatus previously described, may be compactly arranged y passing screw 6 forwardly through the bore in the back wall of the body 1 and assembling the comparatively large stator-penetrating element 12, the flanged disk 11, and the comparatively small element 12 upon the said screw in the order named.

In the practical use of my novel'apparatus, the element 12 is slipped into the stator of a fan untilsaid element is'fiush with the stator iron, care being taken to assure the small end of the bore 14 entering the stator first and in position to aline with one of the four screw holes in the back of the steel shell; the said holes being provided for the engagement of screws through the medium of which the gear case or bearingwas held to the shell. Prior to slipping element 12 into the stator, the two screws which hold the stationary member of the centrifugal switch are removed, the said switch part then being free to come out with the stator winding. The taper pin 20 is then driven firmly into the bore 14, with the flat sides of the taper pin at right angles to the slit 17, and with the steel shell of the fan abutting against the internal shoulder 5 in the body 1. ,The screw 6 is then passed forwardly through the bore in the back wall of the body 1 and is turned to- Ward the right in the bore 13 in the element 12 until the head 7 of the'screw abuts snugly against the back wall of the body 1. The turning of the screw 6 toward the right is then continued, whereupon the stator will be pulled from the shell. With this done the screw 6 is removed and the taper pin 20 is driven rearwardly through the bore 14-, and the element 12 is withdrawn from the stator. Manifestly, the operation described may be 7 carried out in a short period of time and is advantageous, inasmuch as it does not entail the infliction of any damage whatever to the stator or the steel shell complementary thereto. Moreover, the stationary member of the centrifugal switch of the fan need not be disconnected from the winding, as the diameter of the screw 6 enables said screw to pass readily through said centrifugal switch part without liability of dragging or binding.

In using the apparatus, to facilitate the placing of a stator in its steel shell, the switch cord is passed through a hole 30, Fig. 1, in the steel shell of the fan and is pulled through said hole until the'stator is inposition to enter the shell. The switch cord is. then drawn through the bore or aperture in the upper and front portion of the body 1, and the shoulder of the steel shell 31 of the fan is opposed to the internal shoulder of the body 1. The disk 11 is then positioned against the end of the stator 32, and while the parts are relatively arranged as stated, the screw 6 is passed forwardly through the bore in the back wall of the body 1 through the large central bore in the back wall of the steel shell through the stationary part of the centrifugal switch, and is screwed through the threaded central bore of disk 11. The screw is then turned toward'the right until the stator is pulled up firmly against the inner side of the shoulder of the steel shell-of the fan, it being noted, coincidental to this operation, the. operator should continue to draw the switch cord through the aperture or bore in the upper and front portion of the body 1, this with a View to pre cluding the cord bunching in the steelshell of the fan. V v f It will be apparent from the foregoing that my novel apparatus is simple and inex pensive in construction, and is adapted to be operated for the purposes stated with but little effort on the part of the operator. I would also have it understood that the apparatus constituting the illustrated embodiment of my invention has been'successfully used in actual practice and that its use has not been attended by any injury whatever to the fans operated on.

Having described my invention, what I claim and desire to secure by Letters Patent, is: y v

1. A pulling apparatus comprising a shell-like body, open at its forward end and having an internal annular shoulder at said end, a screw bearing in and adapted to abut against said body, a flanged disk threaded on the screw and arranged in advance of the body, a stator-penetrating element threaded on the screw and exteriorly roughened and having a bore off its center and also having a diametrical slit intersecting said bore and the central threaded bore and extending beyond the latter, and a taper pin adapted to be driven in the bore off the center of said element.

2. As a new article of manufacture, a stator-penetrating element, cylindrical in form and exteriorly roughened, and having a threaded bore in its center and also having a bore ofl its center and a slit extending from its perimeter and intersecting and extending beyond the central threaded bore.

3. The combination of a stator-penetrating element, cylindrical in form and exteriorly roughened, and having a central threaded bore and a bore ofi its center and also having a slit extending from its perimeter and intersecting the two bores and extending beyond the threaded bore, and a pin adapted to be driven into the bore off the center of said element;

4. In a pulling apparatus, the combination of a screw, a mounting therefor, an expansible element mounted on the screw and exteriorly roughened and having a longitudinal bore off its center, and a taper pin adapted to be driven in the bore off the center of said element.

5. In a pulling apparatus, the combination of a screw, a mounting therefor, and an expansible stator-penetrating element exteriorly roughened and carried by and movable on the screw, and means for cooperating with said element to expand the same.

6. In a pulling apparatus, the combination of a screw, a mounting therefor, a flanged disk threaded on the screw, an expansible element threaded on the screw and exteriorly roughened, and means for expanding said element.

In a pulling apparatus, the combination of a screw, a mounting therefor, a flanged disk threaded on the screw, a cylindrical, penetrating element having a threaded bore receiving the screw and also having a bore off its center and a slit extending from its perimeter and intersecting both bores and extending beyond the threaded bore, and a taper pin adapted to be driven in the bore off the center of said element.

In testimony whereof I affix my signature.

CHARLES HENRY WALLIOK. 

